Method of manufacturing a multipiece eccentric shaft

Abstract

A drive shaft having a main bearing portion, formed by metal forging, casting or powdered metallurgy, and having coupled thereto a rotor stub portion comprising a steel tube fixedly secured to the main bearing portion, such as by press fitting, friction or laser welding. The rotor stub portion of the drive shaft contains an insert formed with suitable oil hole passages to deliver oil through the rotor stub portion to any desired location along this portion of the drive shaft.

What is claimed is: 
     
       1. A method of manufacturing a drive shaft for use in a scroll compressor comprising the steps of: forging a metal bearing cap for receiving a portion of an orbiting scroll to impart an orbiting motion thereto;   fixedly securing said metal bearing cap forging to a steel tubular rotor shaft; and   forming an oil channel in said rotor shaft for communicating oil to predetermined positions within said rotor shaft by placing an insert containing oil distribution means into said tubular rotor shaft so as to extend essentially the full length of said tubular rotor shaft.   
     
     
       2. The method of claim 1 further including the step of securing a counterweight to said tube rotor shaft. 
     
     
       3. The method of claim 1 wherein said rotor shaft is fixedly secured to said forged bearing cap by either pressing or friction or laser welding. 
     
     
       4. A method of manufacturing a drive shaft for use in a scroll compressor comprising the steps of: casting a metal bearing cap for receiving a portion of an orbiting scroll to impart an orbiting motion thereto;   fixedly securing said metal bearing cap casting to a steel tubular rotor shaft; and   forming an oil channel in said rotor shaft for communicating oil to predetermined positions within said rotor shaft by placing an insert containing oil distribution means into said tubular rotor shaft so as to extend essentially the full length of said tubular rotor shaft.   
     
     
       5. The method of claim 4 further including the step of securing a counterweight to said tube rotor shaft. 
     
     
       6. The method of claim 4 wherein said metal bearing cap casting is fixedly secured to said rotor shaft by either pressing or friction or laser welding. 
     
     
       7. A method of manufacturing a drive shaft for use in a scroll compressor comprising the steps of: forming a bearing cap;   securing said bearing cap to one end of a tube;   inserting a plastic insert having at least one oil distribution passage formed therein into said tube so as to extend essentially the full length of said tube such that said passage is in fluid communication with a second end of said tube; and   securing said insert in said tube.   
     
     
       8. The method of claim 7 further including the subsequent step of forming additional passages in said tube and insert. 
     
     
       9. The method of claim 8 further including the step of inserting and securing an oil pickup tube in said at least one passage. 
     
     
       10. The method of claim 7 further including the steps of: forming a counterweight; and   securing said counterweight to said tube.   
     
     
       11. The method of claim 10 wherein said counterweight is made integral with said bearing cap and secured to said tube therewith as a unit.